Read this free guide below with common Oracle Database Developer interview questions
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As an Oracle Database Developer, you will be responsible for creating, maintaining and supporting the database systems. If you've been called for an interview, it's important to be well-prepared. Here are the top 15 Oracle database developer interview questions with answers to help you ace your interview.
A database is a collection of data that is organized in such a way that it is easily accessible, managed, and updated.
Oracle is a relational database management system (RDBMS) produced and marketed by Oracle Corporation. It is widely used in enterprise applications and is one of the most popular databases in the world.
DELETE is a DML command and removes rows one by one, whereas TRUNCATE is a DDL command and removes all rows in a table at once. Also, TRUNCATE cannot be rolled back, while DELETE can be.
A function is a subprogram that performs a specific task and returns a value.
A stored procedure is a named collection of SQL statements and procedural statements that perform a specific task. It is stored in the database and can be invoked repeatedly.
A trigger is a named program unit that is automatically executed in response to certain events, such as inserting, updating, or deleting a row in a table.
A sequence is a user-defined object that generates a sequence of unique integers. It is often used to generate primary key values for a table.
A join is a way to combine rows from two or more tables based on a related column between them. There are different types of joins, such as inner join, outer join, and cross join.
A subquery is a query that is nested inside another query. It is often used to retrieve data that will be used in the main query.
A view is a virtual table that is based on the result of a SELECT statement. It is often used to simplify complex queries and provide a level of security by restricting access to certain columns or rows.
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. It involves dividing larger tables into smaller tables and defining relationships between them.
Denormalization is the process of adding redundant data to a database to improve performance by avoiding costly joins. It involves duplicating data across multiple tables to reduce the number of joins required to retrieve data.
An index is a database object that helps speed up data retrieval by providing a quick way to access data based on certain columns. It is often created on columns that are frequently used in search or join conditions.
A deadlock is a situation where two or more transactions are waiting for each other to release a resource, such as a table or row, resulting in a situation where none of them can proceed. It can be resolved by rolling back one of the transactions.
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are the properties of transactions that ensure data integrity in a database. Atomicity ensures that a transaction is treated as a single, indivisible unit of work; Consistency ensures that the transaction leaves the database in a valid state; Isolation ensures that transactions do not interfere with each other; and Durability ensures that changes made by a transaction are permanent.
In conclusion, preparing for Oracle database developer interview questions can be time-consuming, but the effort is well worth it. Keep these questions and answers in mind and, more importantly, be ready to demonstrate your skills and experience.
Becoming an Oracle database developer can be a challenging yet rewarding career path. To land a job in this field, you will need to pass an interview that assesses your skills and abilities. Here are some tips for preparing for an Oracle Database Developer Interview.
Preparing for an Oracle Database Developer Interview is crucial to secure a job in this field. It requires understanding the basics, practicing your coding skills, researching the company and the job, being prepared for behavioral questions, and planning your attire and arrival time. By following these tips, you can increase your chances of landing the job of your dreams.
Non-verbal cues can say a lot about your interest and attitude. Display positive body language such as sitting up straight, nodding when appropriate, and keeping your arms uncrossed.
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